Spin Ice - A Magnetic Analogue of Common Water Ice with Emergent Electrodynamics with Deconfined and Fractionalized Excitations

Michel Gingras
University of Waterloo and Canadian Institute for Advanced Research, Quantum Materials Program
Wednesday, November 14, 2018
4:00 pm
NS2 1201
Discovered in 1997, spin ices are frustrated magnetic materials that display a low-temperature state characterized by a nonzero residual magnetic entropy that is intimately related to the proton disorder entropy of common water ice, first rationalized by Linus Pauling in 1935 – hence the name spin ice. In this talk, I will review the salient aspects of these fascinating systems that have sustained the interests of theorists and experimentalists alike for twenty years. In particular, I will emphasize the many layers of "strong emergence" that these systems harbour and comment on their field-theoretic description akin to that of quantum electrodynamics on the lattice with deconfined "matter" excitations and the accompanying gauge boson.
Sasha Chernyshev